Dicrocoelium Dendriticum Found in a Bronze Age Cemetery in Western
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Parasitology International 64 (2015) 251–255 Contents lists available at ScienceDirect Parasitology International journal homepage: www.elsevier.com/locate/parint Dicrocoelium dendriticum found in a Bronze Age cemetery in western Iran in the pre-Persepolis period: The oldest Asian palaeofinding in the present human infection hottest spot region Gholamreza Mowlavi a,⁎, Kobra Mokhtarian b, Mahsa Sadat Makki a,IrajMobedia, Mohammad Masoumian c, Reza Naseri d, Ghasem Hoseini e,ParisaNekoueic, Santiago Mas-Coma f,⁎⁎ a Department of Medical Parasitology and Mycology, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran b Medical Plants Research Center, Shahrekord University of Medical Sciences, Shahrekord, Iran c Department of Archeology, Faculty of Literature and Humanities, Tehran University, Tehran, Iran d Department of Archeology, Faculty of Art and Architecture, Zabol University, Zabol, Iran e Department of Medical Parasitology and Mycology, School of Medicine, Shiraz University of Medical Sciences, Shiraz, Iran f Departamento de Parasitología, Facultad de Farmacia, Universidad de Valencia, Av. Vicente Andrés Estellés s/n, 46100 Burjassot, Valencia, Spain article info abstract Article history: Dicrocoeliasis of animals and humans is caused by trematode species of the genus Dicrocoelium,mainly Received 13 January 2015 Dicrocoelium dendriticum in ruminants of the Holarctic region. D. dendriticum may be considered an old parasite, Received in revised form 12 February 2015 probably related to the appearance and diversification of Eurasian ovicaprines, occurred 14.7–14.5 million years Accepted 25 February 2015 ago. The oldest palaeoparasitological findings of Dicrocoelium in domestic animals and humans date from more Available online 6 March 2015 than 5000 years BC in Europe. Eggs of D. dendriticum have been found in a burial of a Bronze Age cemetery – fi Keywords: (2600 2200 BC) close to Yasuj city, southwestern Iran. This is the oldest nding of D. dendriticum in the Near Dicrocoelium dendriticum East, where present human infection reports are more numerous than in other world regions where human Eggs dicrocoeliasis is rare and sporadic. This palaeofinding in the Zagros mountainous chain area is of interest by its Burial remains location close to Persepolis, suggesting a narrow relationship between humans and herbivorous animals in Bronze Age cemetery these highlands. Domestic ruminant populations of these highlands were following a repeated contact with 2600–2200 BC those of the western flat lowlands of the Fertile Crescent thanks to annual altitudinal transhumance migrations Iran of the nomadic pastoral tribes with their herds living throughout Zagros Mountains in the several millennium pe- riod BC. It is concluded that D. dendriticum spread together with sheep and goats westward throughout Europe from the Fertile Crescent during the 8000–6000 year BC period and somewhat later southward into Africa, both spreads facilitated by the low specificity of that trematode species regarding the snail and ant intermediate hosts. © 2015 Elsevier Ireland Ltd. All rights reserved. 1. Introduction 2–2.5 mm, and which is commonly known as the lancet fluke, the lance- olate fluke, the little liver fluke or the small liver fluke. It shows a scarce Dicrocoeliasis is a trematodiasis caused by digenean species of the definitive host specificity, although with pronounced preference for ru- genus Dicrocoelium (Trematoda: Dicrocoeliidae), mainly Dicrocoelium minants which may be considered the true original hosts, among which dendriticum (=Dicrocoelium lanceolatum) throughout and Dicrocoelium mainly mid-sized ruminants as sheep and goats and secondarily large hospes in Africa southward from the Sahara. The adult stage is a parasite ruminants as cattle. Their transmission involves a three host life cycle, of the bile ducts and gall bladder, of a relatively small size of about 8–14/ with embryonated eggs of 35–45/22–30 μm expelled with the mammal feces, to follow a completely terrestrial life cycle. Many terrestrial snail species act as first intermediate hosts, with differences depending on ⁎ Correspondence to: G. Mowlavi, Department of Medical Parasitology & Mycology, the geographical area. Several ant species, mainly belonging to the School of Public Health, Tehran University of Medical Sciences, Iran, P.O. Box 6446, Tehran 14155, Islamic Republic of Iran. Tel./fax: +98 2188951392. genus Formica, act as second intermediate hosts inside which the infec- ⁎⁎ Correspondence to: S. Mas-Coma, Departamento de Parasitologia, Facultad de tive metacercariae develop. The ruminant hosts become infected by Farmacia, Universidad de Valencia, WHO Collaborating Centre on Fascioliasis and Its ingesting these ants when grazing [1]. Snail Vectors, FAO-United Nations Reference Centre for Parasitology, Av. Vicent Andres Infection by D. dendriticum is an important parasitic disease in ani- Estelles s/n, 46100 Burjassot, Valencia, Spain. Tel.: +34 96 354 42 98; fax: +34 96 354 mals from an economic and health viewpoint [2]. In humans, clinical 47 69. fi E-mail addresses: [email protected] (G. Mowlavi), [email protected] symptoms of true dicrocoeliosis are neither uniform nor speci c. As (S. Mas-Coma). with other liver fluke infections, the pathology depends on the number http://dx.doi.org/10.1016/j.parint.2015.02.007 1383-5769/© 2015 Elsevier Ireland Ltd. All rights reserved. 252 G. Mowlavi et al. / Parasitology International 64 (2015) 251–255 of flukes present and the duration of the infection. Because of the small the interesting relationships of the mountainous area in question with size of the fluke and its smooth and spineless surface, mechanical and the western flat lowlands of the Fertile Crescent by means of nomadic toxic damages are much less than in fascioliasis and opisthorchiasis tribes practicing altitudinal transhumance with their herds. [1]. Moreover, the main route of migration of D. dendriticum to reach the liver is via the bile ducts, instead of via the abdominal cavity route 2. Materials and methods as in Fasciola hepatica [3]. Highly pathogenic infections in humans have been however described, as rare neurological symptoms and sub- Specimens including soil samples obtained from three burials and sequent meningeal syndrome [3,4] and recently also involvement in an one burial jar were collected during a rescue excavation in a Bronze “ ” allergic pharyngitis syndrome known as Halzoun [5]. Humans acquire Age cemetery (2600–2200 BC) located in the neighborhood of the city the infection accidentally, by swallowing an infected ant together with of Yasuj, Kohkilooye and Boyer-Ahmad province, in southwestern the food, such as vegetables, fruits, etc., while staying in an endemic Iran, in the late winter 2012. The archeological remains are located at area. 70 km northwestward of the aforementioned city, at the coordinates This parasite species has a more or less cosmopolitan distribution in of 31°9′13″ N and 51°6′14″ E(Fig. 1). Excavation procedures were herbivorous mammals, mainly in ruminants of the Holarctic region. The undertaken in a way to prevent burial materials to be contaminated parasite is believed to have been introduced into the New World with with external soil. the extensive importations of dairy cattle from European countries. Archeological dating was comparatively proved, based on potteries Human infections have been recorded in D. dendriticum enzootic and bronze items found in the graves. For the retrieving of helminth areas. Although the majority of these infections are of rare and sporadic eggs, the rehydration technique in 0.5% trisodium phosphate was occurrence, they are undoubtedly underestimated. Most infections are used, according to the method successfully practiced so far [17].Recov- only spurious, the appearance of eggs in stools being due to the inges- ered eggs were photographed, measured and identified morphological- tion of infected livers of sheep, goat and cattle, eggs being detected in ly, according to available references. feces for only a few days. The reason for the availability of infected ani- mal livers on the market is that not all infected livers show signs of the infection. Genuine human infection can be verified through parasite 3. Results finding in surgical operations, evidence of permanent egg shedding through time, egg recovering in duodenal aspirates, or the existence of A total of 1100 slides from rehydrated soil samples were thoroughly related symptomatology. Human infection has been reported from investigated under the light microscope. During this careful microscopic Asia, northern Africa, Europe, North America and South America [1]. investigation, 750 slides were also thoroughly examined for the eventu- D. dendriticum may be considered an old parasite, probably related al detection of helminth eggs. fi to the appearance of Eurasian ovicaprines. The diversification of Two eggs showing typical trematode features could be identi ed in Caprinae occurred 14.7–14.5 million years ago (mya) and the diver- grave N2 (Fig. 2). When microscopically measured, these eggs proved gence of Ovis and Capra 11.3 mya, the later species diversification within to be brown, thick-shelled and with an inconspicuous operculum, of a μ these two genera having been dated around 5.1 to 6.8 mya [6].Wildher- size of 38.9/23.0 m of length/maximum width, in an excellent conser- bivore domestication began around 10,000 years ago at the dawn of the vation condition and even allowing for the distinction of miracidium Neolithic in the region known as the Fertile Crescent, a formerly fertile, remains inside. now partly desert, area in the Near and Middle East which was an agri- cultural region extending from the Levant (lands bordering the Eastern 4. Discussion shores of the Mediterranean and Aegean seas) eastward including modern-day Israel, Jordan, Lebanon and western Syria, into southeast The characteristics and size of the trematode eggs found fully agree Turkey and, along the Tigris and Euphrates rivers, into Iraq and the with those of the eggs of the species D. dendriticum, which are known western flanks of Iran [7–10]. The Neolithic period was an era of to have a length/width range of 35–45/22–30 μm [18].